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Finding the Fourth Proportional to 6,666.66, 9,999.30 and 1,986.69

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Solution

The fourth proportional to 6,666.66, 9,999.30 and 1,986.69 is: 2,979.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,666.66 : 9,999.30 = 1,986.69 : x
  2. Step 2: Convert to fraction form
    6,666.66/9,999.30 = 1,986.69/x
  3. Step 3: Cross multiply
    6,666.66x = 9,999.30 × 1,986.69
  4. Step 4: Simplify right side
    6,666.66x = 19,865,509.32
  5. Step 5: Solve for x
    x = 19,865,509.32/6,666.66
  6. Step 6: Final answer
    x = 2,979.83

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.